Next, add the three abstract methods in Listing 4. Each one represents a step in the workflow.

接下来，添加清单4所示的三个抽象方法。每一个方法表示工作流程中的一个步骤。

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The concept of wait states might seem a bit abstract and you might wonder why this is relevant in a discussion about workflow or process languages.

等待状态的概念或许显得有些抽象，你或许会问这和工作流或过程语言的讨论有什么关联性。

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Regardless of workflow, software engineers are all the time working with non-tangible, abstract, and flexible things -- pure mindware.

不管工作流程如何，软件设计者终日从事于无形的、抽象的和灵活的事物——纯智力劳动。

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